/* films3.c -- 使用抽象数据类型（ADT）风格的链表 */
/* 与 list.c 一起编译 */

#include <stdio.h>
#include <stdlib.h>     /* 提供 exit() 原型 */
#include "list.h"       /* 定义 List、Item */

void showmovies(Item item);
char * s_gets(char * st, int n);

int main(void)
{
    List movies;
    Item temp;

    /* 初始化 */
    InitializeList(&movies);
    if (ListIsFull(&movies))
    {
        fprint(stderr, "No memory available! Bye!\n");
        exit(1);
    }
    
    /* 获取用户输入并存储 */
    puts("Enter first movies title:");
    while (s_gets(temp.title, TSIZE) != NULL && temp.title[0] !='\0')
    {
        puts("Enter your tating <0-10>:");
        scanf("%d", &temp.rating);
        while (getchar() != '\n')
            continue;
        if (AddItem(temp, &movies) == false)
        {
            fprintf(stderr, "Problem allocating memory\n");
            break;
        }
        if (ListIsFull(&movies))
        {
            puts("The list is now full.");
            break;
        }
        puts("Enter next movie title (emptyj line to stop):");
    }
    
    /* 显示 */
    if (ListIsEmpty(&movies))
        printf("No data entered. ");
    else
    {
        printf("Here is the movie list:\n");
        Traverse(&movies, showmovies);
    }
    printf("You enter %d movies.\n", ListItemCount(&movies));

    /* 清理 */
    EmptyTheList(&movies);
    printf("Bye!\n");

    return 0;
}

void showmovies(Item item)
{
    printf("Movie: %s Rating: %d\n", item.title,
        item.rating);
}

char * s_gets(char * st, int n)
{
    char * ret_val;
    char * find;
    
    ret_val = fgets(st, n, stdin);
    if (ret_val)
    {
        find = strchr(st, '\n');`   // 查找换行符
        if (find)                   // 如果地址不是NULL，
            *find = '\0';           // 在此处放置一个空字符
        else
            while (getchar() != '\n')
                continue;           // 处理输入行的剩余内容
    }
    return ret_val;
}